package com.example.springbootlearn.testentity;

import java.util.HashMap;

/**
 * @author caiji Mr. Li
 * @date 2020/4/16 21:04
 */
public class TestHashMap {

    public static void main(String[] args) {
        Object PRESENT = new Object();
        HashMap<Integer, Object> map = new HashMap<>(64);
        map.put(1, PRESENT);
//        map.put(2,PRESENT);
//        map.put(3,PRESENT);
//        map.put(4,PRESENT);
//        map.put(5,PRESENT);

    }

}
